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Fix compilation with newest ImGui #5173

Job	Run time
FreeBSD Debug x86_64	7m 6s
Ubuntu Debug amd64 (gcc)	5m 50s
FreeBSD Release x86_64	9m 12s
Windows Debug x64 (msvc)	35m 12s
OpenBSD Debug x86_64	10m 35s
Ubuntu Release amd64 (gcc)	6m 37s
Windows Debug x86 (msvc)	6m 12s
OpenBSD Release x86_64	9m 5s
Ubuntu Debug amd64 (clang)	46s
Windows Mixed x64 (msvc)	35m 13s
NetBSD Debug x86_64	10m 27s
Ubuntu Release amd64 (clang)	56s
Windows Mixed x86 (msvc)	5m 24s
NetBSD Release x86_64	9m 7s
Alpine Debug x86_64 (gcc)	6m 49s
Windows Release x64 (msvc)	10m 36s
Alpine Release x86_64 (gcc)	24m 44s
Windows Release x86 (msvc)	9m 41s
Alpine Debug x86 (gcc)	7m 29s
Windows Release Master Gold x64 (msvc)	9m 21s
Alpine Release x86 (gcc)	26m 55s
Windows Release Master Gold x86 (msvc)	8m 37s
Fedora Debug x86_64 (gcc)	6m 14s
Fedora Release x86_64 (gcc)	7m 33s
macOS 13 Debug x86_64 (clang)	13m 3s
macOS 13 Release x86_64 (clang)	10m 0s
macOS 15 Debug arm64 (clang)	4m 18s
macOS 15 Release arm64 (clang)	6m 24s
	5h 3m 26s

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